tup1 = ("physics", "chemistry", 1997, 2000)
tup2 = (1, 2, 3, 4, 5)
tup3 = ("a", "b", "c", "d")
print(tup1[0:3])
# 元组不能修改
# 元组不删除
# 元组可以连接创建新元组


